Gasket



sept. 26, 1933. Y L. WALD 1,927,859

GASKET Filed Jan. 26 1932 Patented Sept. 2.6, 1933 y Y ,y y Y' v UNITED srArrz-sI PATENT-*foF-Flcg Vellumoil Company, Boston, Mass., a corpo- 4ration of Massachusetts l Application January 26, 1932. Serial No.'-5 88,865

' 's claims. (C1. 15a-455)* A relatively soft compressible gasket material with the magnesium alloys more recently being admirably adapted to withstand the action of used for aeroplane engines and under some con-V Water, oil, gasoline, or the like, comprises abrous lditions it has been found to occur in connection base materialu containing tanned Aglue and glywith aluminumor aluminum alloys. t

5 cerine. This base material is preferably closely In'order to prevent this corrosion of the 'metal' 60 felted as onV a paper machine.' It is found in surfaces a layer of inert material inertA and practice, however, that if such material is brought impervious to such corrosive constituents., such into contact with certain metals, such as the as metal foilr may bev secured-to the 'face'or magnesium alloys which are now commonly used faces of the gasket base` material by adhesive. .l

in aeroplane engine construction because of their Various metals from which foils may be made 65 light weight, corrosion of the metal may result. may be used for this purpose, such as aluminum, Investigation has shown that this is probably due tin, lead, zinc, and various alloys, and in general in large measure, at least, to the glycerine in the such material should be chosen as will not have gasket which forms alcoholates by reaction with any detrimental effect by reason of electrolysis certain metals. y I or otherwise with the metal part against'which 70 The object of this invention is to prevent conthe gasket is to be held. stituents in such gasket or similar material from In connection with the magnesium alloy articausing corrosion of the parts to which they are cles aluminum foil vhas been` found quite satisapplied and yet to retain the desirable characterfactory though undoubtedlyfoils of several other .Y

istics of such materials. I have discovered that metals or alloys might also be employed if 75 f this may be done vby securing to the face or faces desired` of the gasket material which come into contact The foil as at 2, as shown in Figure V3, may with the parts likely to eorrode, a protecting layer be secured directly to the gasket base material of inert material such as metal foil, either of a by means of a suitable adhesive shown' atv 4, l

nature in itself not subject to such corrosion or one adhesive which is satisfactory being sodium 80 'Y protected from such corrosion by an inert cement silicate. vThere are, however, other cements on or adhesive by which the foil or other inert layer the market, some having Vegetable bases, and is secured to the gasket material. sold under various trade names, also suitable for For a more complete understanding of this in- Athe purpose. These various adhesive agents or ventiOn, reference may be had vto theaccompanycements act not only to secure the metal foil 85- ing drawing in which to the gasket base -material but they also arey Figure l is a fragmentary View partly in secimpervious to and act to prevent direct contact, tion showing a joint employing a gasket conbetween the foil and any constituents of thel structed in accordance with the invention. base material which might tend to cause corro- Figure 2 is a perspective of the gasket. sion thereof. f l 90 Figure 3 is a somewhat diagrammatic cross sec- In place of adhesivelyr securing the foil directly tion to a much larger scale of the gasket material. to the face of the. base material `it may be se- Figure 4 is a section somewhat similar to Figcured adhesively to the outer face of a paper ure 3, but showing a different and preferred conlayer, as shown at l0 in Figure 4, 11 indicating struction. y the layer of adhesive bywhich the paper layer 95 Referring to the drawing the gasket shown and the foil are secured together.` This is usucomprises a brous base material as 1, shown best ally preferable Yto securing the foil directly to in Figures 3 and 4, which preferably is a porous the gasket base material since it is easier to paper and which is saturated with a packing masecure a good bond between the foil and the terial which may comprise glutinous material, paper than it is betweenthe foil and the gasket such as glue, together with a softening agent such base material. The paper base 10 to which the as glycerine, and the whole treated with a tanfoil lis adhesively secured, as by the sodium silining agent such as formaldehyde, tannin, or the cate or other suitable agent, may then be readily like, to insolubilize the glue. Such material is' secured to the face of the gasket base material,

highely resistant to the action of water even for this purpose ordinary animal glue being satiswhen hot and to the action of oils, greases, and factory. Animal glue is not a satisfactory adgasoline and the like, but when applied directly hesive for securing the metal foil directly.

to certain types of metal surfaces under some Preferably the gasket base material in sheet conditions of use it causes corrosion of such form has secured to opposite faces thereof the metal surfaces. This has been particularly true metal foil or other inert layer either directly the base material are covering is also protected-from of the base which might tend` to or vvith the interposed paper layer, and then the gaskets are cut from this composite sheet material, one such gasket being shown in Figure 2. It then presents inert outer layers which engage directly withA the metal vportions and 21 which it is desired to secure together, suitable means such as the securing screws 22 being passed through holes in the mating portions o f the parts l20 andr21 and through' ho1es`23 in the gasket.

By this construction anyvcorrosive *agentsy in prevented from comingj into direct contact Withfthe metal parts which they would be liable to corrode andthe foil tion thereof by the adhesive layer by which the yfoil is secured tothe base material. Since the base material itself is highly resistant oil, gasoline, or the like only that face faces which would otherwise contact directly with f the Vmetal'need be coveredby the protecting layer so that 'the gaskets themselves maybe died out from the' sheet material to the face or faces of Which the Y v the'cut edges 'of the basebeing left'exposed.

protective layer has been applied,

' From the foregoing description `of4 certain em,-

' bodiments of this invention' it `shouldybe' evident to thoseskilledinthe artf that various changes t9 Water, v or those 2. Anl article of manufacture kcomprising a :,fibrous base, and a saturant for said .base including glycerine, said base having a facing adhesively secured thereto, said facing comprising a" layer-"of paper and a layer of metal foil secured together in face to face relation with said metal foil outwardly ldisposedsaid facing being imperviolusto constituents of said base liable to cause corrosionof certain metals with which said article maycontact under operating conditions. 3. mA gasket comprising aiibrousbase impreghated' with packing material, saidr base having af'facing layer i cluding metal foil secured, to

n said base by, adhesive, said layer being imparvious t base.

i corrosivev elements exige;hatingy from said loc 

